Step 1

Preheat the oven to 325ºF. Spray a stoneware bar pan or other large sheet pan (with at least 1" sides, about 14¾" x 10½") with cooking spray. Set aside.

Step 2

In a large mixing bowl, whisk together the eggs, oil and water.

Step 3

Add the 3 box brownie mixes and fold together with a rubber spatula, being careful not to over mix the brownies.

Step 4

Spread the brownie batter evenly in the prepared pan.

Step 5

Bake for 50 minutes or a toothpick inserted into the center of the brownies have no batter but a few moist crumbs.

Step 6

Allow the brownies to cool before cutting.

Step 7

Store in an airtight container at room temperature for up to 4 days. You can store any leftover brownies in the freezer for up to 6 weeks.